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If you change the :hover background the 'normal' state has to be changed too.

Selectors with id are unique, so don't require any tags before them. It only slows the css parsing.
Not div#mainnavbar ul li a but #mainnavbar ul li a
Not div#mainnavbar ul li#portallink a:hover but #portallink a:hover

At least 98% of internet users' DNA is identical to that of chimpanzees